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SI9113 Demonstration Board

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71117 pdf
Si9113 Demonstration Board
Vishay Siliconix
D ISDN-NT Input Voltage Range 28 V to 99 V
D Non-Polar Input
D 3.3-V/120-mA, 40-V/12-mA Outputs With Up To 80% Efficiency
D Up to 68% Efficiency at 80-mW Load
D 40 V Isolated By 3 kV From Input And 3.3-V Output – Si9113D1
D 3.3 V, 40 V Isolated By 1.5 kV From Input/Each Other – Si9113D2
D Current Mode Control, 0.6-V Fast Over-Current Protection
D Max 50% Duty Cycle Operation
D 1.3-MHz Error Amp
D Soft-Start
D <10-mA Supply Current for +VIN <18 V
D Programmed Start/Stop
D Internal Start-Up Circuit
D Power_Good Output
As discussed in application note, AN728, the Si9113 power
supply controller is an ideal choice for ISDN terminal
equipment, where high efficiency at a low power level is one of
most important criteria. Therefore, Vishay Siliconix has
developed versions of a dual output flyback application
demonstration boards, the Si9113D1 and the Si9113D2, which
use different regulation schemes. These readily available
demo boards are configured to deliver approximately 800 mW
at 3.3-V, and40-V. These outputs and can be easily modified
for other output voltages at approximately same power level.
The flyback converters are designed to operate from a wide
input voltage range of 28 V to 99 V and are polarity protected
by a diode bridge. The Si9113D1 and Si9113D2, both operate
at 20-kHz switching frequency to achieve the best possible
efficiency. The transformer is selected to be slightly larger in
this application so that the same area product would be good
enough for an even lower window utilization factor (w.u.f.)
transformer in order to meet the stringent requirements of
clearance and creepage distances.
10% to100% load range, including the set point accuracy.
Correspondingly. the transformer must be specified with tight
tolerance to achieve the given set point accuracy. The 40-V
output is isolated from both the input and 3.3-V output by
minimum 3 kVrms isolation.
The Si9113D2 uses the auxiliary output (VCC bootstrap
winding) for sensing. Both VOUT1 (3.3 V) and VOUT2 (40 V)
follow the auxiliary output, residing on one core and sharing the
same flux. Both the outputs are isolated from the input as well
as from each other by 1.5 kV and moderately regulated to
Each demonstration board uses all surface mount
components except the high voltage electrolyte capacitor and
are fully assembled and tested for quick evaluation. Test points
are provided for the power_good signal and the closed loop
response measurement.
The Si9113D1 senses and tightly regulates the main output
VOUT1 (3.3 V), which has the common ground as input and the
secondary output VOUT2 (40 V) is regulated to within $10% at
Included in this document are the Bill-Of-Materials,
Schematics, PCB Layout of the Demo Boards and actual
The demonstration board layout is available in Gerber file format. Please contact your Vishay Siliconix sales representative or
distributor for a copy.
Si9113D1— VOUT1 (3.3 V) Tightly regulated, non-isolated
VOUT2 (40 V) Loosely regulated, 3 kV isolated
Si9113D2— VOUT1 (3.3 V) Moderately regulated, 1.5 kV isolated
VOUT2 (40 V) Moderately regulated, 1.5 kV isolated
Document Number: 71117
29-Feb-00 S FaxBack 408-970-5600

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71117 pdf
Vishay Siliconix
The Si9113D1 and Si9113D2 are designed to operate in
discontinuous mode at nominal line and load conditions. Both
demo boards use the same operational procedure, as follows:
1 Visually inspect the PCB to be sure that all the components
are intact and no foreign substance is lying on the board.
2 Solder the leads at C1 negative and MOSFET Q1 drain to
monitor the drain waveform on the oscilloscope.
3 Reduce the source voltage to zero and connect it through
the dc ammeter at VIN + and VIN –. Connect the dc
voltmeter precisely across VIN + and VIN –. For the
application where input is of fixed polarity, the diode bridge
BR1 can be eliminated by shorting pin 1 to 4 and pin 2 to
3 to achieve even higher efficiency.
4 Connect the voltmeter precisely across VOUT1 – Com1 and
VOUT2 – Com2 for the output voltage measurement.
Connect the oscilloscope ground to C1 negative while the
probe to Q1 drain to observe the switching waveforms.
5 Slowly increase the input voltage while monitoring the input
current meter. Note the input current is less than 10 mA at
18 VIN and continue to increase the voltage further till the
circuit turns on at approximately 24 V.
6 Set the input voltage to 48 V nominal and monitor the drain
waveform, switching frequency, input and output ripple and
7 The efficiency, line, load and cross regulation can be
measured by varing the line between 28 to 99 V, and the
load between 10% and 100%.
Drain Voltage and Current
The circuit is designed to operate in discontinuous mode at
nominal line and full load. The transformer is cleverly designed
to reduce the leakage inductance. Refer to Figure 1 for the
drain voltage and current waveforms. The current starting from
zero indicates the discontinuous mode operation and absence
of any leakage spike at drain shows the tight coupling between
the windings.
VIN = 28 V
Outputs – Full lLoad
Ch1 – Primary Current (0.1A/div)
Ch3 – Drain Voltage (20 V/div)
FIGURE 1. Drain Voltage and Current Waveform – Si9113D2
www.Vishay S FaxBack 408-970-5600
3.3 V @ 120 mA
3.3 V @ 12 mA
IOUT2 (mA)
12.00 15.00
FIGURE 2. VOUT2 (40 V) Load/cross Regulation – Si9113D1
Document Number: 71117

Part Number 71117
Description SI9113 Demonstration Board
Maker Vishay Siliconix - Vishay Siliconix
Total Page 11 Pages
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